<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>IP端口搜索</title>
    <!-- Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css">
    <style>
            /*web background*/
            .container{
                display:table;
                height:100%;

            }

            .row{
                display: table-cell;
                vertical-align: middle;
            }
            /* centered columns styles */
            .row-centered {
                text-align:center;
            }
            .col-centered {
                display:inline-block;
                float:none;
                text-align:left;
                margin-right:-4px;
            }
    </style>
    <title>Title</title>
</head>
<body>
    <div class="navbar navbar-default">

    <div style="width:400px; margin:0 auto;"><!--宽度设置你的内容的宽度-->

        <ul class="nav navbar-nav">

            <li><a href="/index/">主页</a></li>

            <li><a href="/whois-search/">whois查询</a></li>

            <li><a href="/subdomain-search/">子域名搜索</a></li>

            <li><a href="/ipandport-search/">ip端口搜索</a></li>

        </ul>

    </div>

    </div>
        <!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->
        <script src="//cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>

        <!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
        <script src="//cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
</body>
</html>